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Isoprene emission is not temperature-dependent during and after severe drought-stress: a physiological and biochemical analysis

, : Isoprene emission is not temperature-dependent during and after severe drought-stress: a physiological and biochemical analysis. Plant Journal 55(4): 687-697

Black poplar (Populus nigra L.) plants grown at 25 and 35 degrees C were subjected to drought stress to assess the combined impact of two consequences of global climate change--rising temperature and drought--on isoprene biosynthesis and emission. At both temperatures, photosynthesis was inhibited by moderate drought, but isoprene emission only decreased when drought was prolonged. The mRNA transcript level, protein concentration and activity of isoprene synthase (ISPS) changed in concert with isoprene emission during drought stress. However, ISPS activity decreased before isoprene emission during drought development, indicating a tighter control of the emission at a transcriptional or post-transcriptional level under moderate drought stress, and at both temperatures. A residual isoprene emission was measured when photosynthesis was totally inhibited after 35 days of drought. This photosynthesis-independent emission of isoprene was probably dependent on a cytosolic carbon supply as all the properties of ISPS were drastically inhibited. Isoprene emission was associated with dark respiration during the entire drought stress period, and at both temperatures, indicating that the two processes are sustained by, but do not compete for, the same carbon source. Isoprene emission was directly related to phosphoenolpyruvate carboxylase activity in plants grown at 25 degrees C and inversely related in plants grown at 35 degrees C, suggesting a strong temperature control on the regulation of the pyruvate flowing from the cytosol to the plastidic isoprenoid biosynthetic pathway under drought stress and recovery. In re-watered plants, the temperature control on isoprene emission was suppressed, despite complete recovery of photosynthesis and ISPS activity similar to levels in plants subjected to mild drought stress. Our results reveal the overriding effects of drought on isoprene emission, possibly affecting protein level or substrate supply. These effects may largely offset the predicted impact of rising temperatures on the emission of isoprene in terrestrial ecosystems.


PMID: 18445130

DOI: 10.1111/j.1365-313X.2008.03538.x

Other references

Murariu D., 1984: List of current mammals from romania scientific and romanian names. Travaux du Museum d'Histoire Naturelle "Grigore Antipa" 26: 251-262

Schoenberg, H.W.; Mikuta, J.J., 1973: Technique for preventing urinary fistulas following pelvic exenteration and ureteroileostomy. Journal of Urology 110(3): 294-295

Mefford, I.; Oke, A.; Keller, R.; Adams, R.N.; Jonsson, G., 1978: Epinephrine distribution in human brain. The distribution of epinephrine (E) in human brain was analyzed by a liquid chromatographic method. E, though detectable in most areas sampled, was highly localized in those areas previously known to contain highest norepinephrine (NE) concentrati...

Bakshi, T.S.; Coupland, R.T., 1959: An anatomical study of the subterranean organs of Euphorbia esula in relation to its control. Young roots of Euphorbia esula exhibit a structure similar to that of a typical dicotyledonous species. In older roots, wood comprises as much as two-thirds of the total tissues. Cork is several layers thick, and lenticels are of open type. Pericy...

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Shakhov, A.G.; Buzlama, V.S.; Ageeva, T.I.; Sukhov, N.M.; Lesnykh, V.I., 1980: Resistance and stress in the etiology and prevention of bronchopneumonia in swine. Veterinariia: 51-53

Sen, S.; Tripathy, S.P.; Chimanpure, V.M.; Patil, A.A.; Bagul, R.D.; Paranjape, R.S., 2007: Human immunodeficiency virus type 1 drug resistance mutations in peripheral blood mononuclear cell proviral DNA among antiretroviral treatment-naive and treatment-experienced patients from Pune, India. The prevalence of HIV drug resistance (HIVDR) mutations in the HIV protease (PR) and reverse transcriptase (RT) genes was estimated from peripheral blood mononuclear cells (PBMCs) in a study population of 25 antiretroviral (ARV) therapy-naive and...

Ashley J.S.A.; Gardner M.J., 1969: The mortality and morbidity of hyperplasia of the prostate in teaching and regional board hospitals. British Journal of Preventive & Social Medicine 23(1): 61

Anderson, J.R., 1995: Food and agriculture: a global perspective. The paper begins by defining dimensions of reality, covering time, population and food needs, before going on to examine the issue of degradation versus sustenance in relation to agricultural resources. The land resource, water resource and knowle...